I fully agree on the Sony 28-70 heavily relying on digital corrections. Only Canon products face criticism...Hmmm, funnily afaik, Sonys 28-70mm F2 (among other lenses) relies on digital correction as well. Sony even stated they were only able to built these lenses so lightweight because they relied on dc for vignetting and distortion. So, if you despise Canon for dc, please don't praise Sony lenses for it.
I really don´t mind digitally corrected lenses. In fact, I´d like to see some kind of proof which states optical corrected lenses are in fact better. Furthermore, I love the weight savings DC provides. Yes, I mean the VCM line-up. But one should also compare Canons optical corrected 28-70mm F2 (1.427 kg) and Sonys offering (0,918 kg): a difference of 500gr is huge! I don't how much DC does account for, but given the choice I´d go for a lighter DC anytime.
On the other hand, it depends -for Canon, since I don't care at all about Sony - on how heavy these corrections are, compared to purely optical ones. If a lens needs to "light up" corners by 5 EV, or if corners need massive stretching to cover FF, this could render those lenses unsuited for night pictures, due to noise.
Nothing against digital correction, within certain limits. What matters is the resulting picture, as long as it does not suffer excessively from corner noise, I'm ok with digital.
And yes, lighter is always better...
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